Garfagnini, A. (2014) The GERDA experiment at Gran Sasso: Search for neutrinoless double beta decay in germanium 76. Il nuovo cimento C, 37 (1). pp. 139-143. ISSN 1826-9885
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Abstract
The GERmanium Detector Array (GERDA) is a low background experiment at the Laboratori Nazionali del Gran Sasso (LNGS) designed to search for the rare neutrinoless double beta decay (0νββ) of 76Ge. In the first phase of the experiment, high purity germanium diodes inherited from the former Heidelberg-Moscow and IGEX experiments are operated “bare” and immersed in liquid argon, with an overall background environment of 2 · 10−2 cts/(keVkg yr), a factor of ten better than its predecessors. Preliminary measurements on two neutrinos double beta decay (2νββ) giving T2ν 1/2 = (1.88 ± 0.10) · 1021 yr and a recently published background model are discussed in the paper. Results on 0νββ are expected in summer 2013 and, in the absence of a signal, the expected sensitivity is T0ν 1/2 > 1.9 × 1025 yr. Phase II of the experiment is scheduled to start at the end of 2013, after an upgrade shutdown, with an additional set of new detectors. Thanks to the new design of the diodes and to the introduction of liquid argon instrumentation techniques, the experiment aims to reduce further the expected background to about 1 · 10−3 cts/(keVkg yr), and improve the 0νββ sensitivity to T0ν 1/2 > 1.35 · 1026 yr.
| Item Type: | Article |
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| Uncontrolled Keywords: | X- and γ-ray sources, mirrors, gratings, and detectors ; Radiation detectors ; Decays of heavy neutrinos ; β decay; double β decay; electron and muon capture |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 08 May 2020 14:41 |
| Last Modified: | 08 May 2020 14:41 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/18483 |
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